linux-kernel - [PATCH] drm/msm/dp: Initialize the INTF

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Message-Id: <20210722024434.3313167-1-bjorn.andersson@linaro.org>
Date:   Wed, 21 Jul 2021 19:44:34 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Kuogee Hsieh <khsieh@...eaurora.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Tanmay Shah <tanmay@...eaurora.org>,
        Chandan Uddaraju <chandanu@...eaurora.org>,
        Guenter Roeck <groeck@...omium.org>,
        Vara Reddy <varar@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/msm/dp: Initialize the INTF_CONFIG register

Some bootloaders set the widebus enable bit in the INTF_CONFIG register,
but configuration of widebus isn't yet supported ensure that the
register has a known value, with widebus disabled.

Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support")
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 drivers/gpu/drm/msm/dp/dp_catalog.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 23458b0ddc37..37cb1102a0ca 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -747,6 +747,7 @@ int dp_catalog_panel_timing_cfg(struct dp_catalog *dp_catalog)
 	dp_write_link(catalog, REG_DP_HSYNC_VSYNC_WIDTH_POLARITY,
 				dp_catalog->width_blanking);
 	dp_write_link(catalog, REG_DP_ACTIVE_HOR_VER, dp_catalog->dp_active);
+	dp_write_p0(catalog, MMSS_DP_INTF_CONFIG, 0);
 	return 0;
 }
 
-- 
2.29.2